As for "brush busting bullets"... they are a pure myth. If your bullet hits a twig, it will deflect no matter how big it is or what shape it has. It's only a question of how much. I missed a shot at a deer across a creek bed because the 410 grain, .50 cal Great Plains FP conical bullet I shot at it glanced off a 3/8" tree branch. I say glanced because the branch was still dangling from after being hit, which is how I know I hit it. The shot was about 75 yards, with the deer about 15 yards past the branch. The bullet missed by about 10-15 FEET low and right. If a 410 grain .50 cal FP can get deflected that much by hitting less than 3/8" of tree branch, they a 150gr RN .277" bullet doesn't stand a chance. If I had a .270 I'd just stick with the tried and true 130 grain SP spitzers. If you want a heavier bullet, you could also try the 150gr Rem Core-Locks. This is what my brother uses from his .270 Win Rem 750 Woodsmaster and they are extremely effective on deer.

Mike